Book/Report

FZJ-2018-00759

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Large magnetic coils-design accompanying calculation and optimization regarding orthotropic interlayers, temperature and elastic supports-derivation of a special finite element : the TEXTOR project

Stelzer, J. F.FZJ* ; Sievers, A.FZJ* ; Welzel, R.FZJ*

1976
Kernforschungsanlage Jülich, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/16700

Report No.: Juel-1349

Abstract: This paper deals with finite element calculations of large coils as they are used as main coils in tokamaks. They consist of copper layers with glass fibre reinforced resin interlayers inbedded in a strong steel ring. The interlayers behave extremely orthotropic. Therefore cylinder wall elements with radial-tangential orthotropic behavior were developed. Regard is given, too, to the direction dependent thermal expansions because the calculations also include the heated state of the coils. In a first analysis model the several epoxy layers are condensed to only one the thickness of which is equal to the sum of the single sizes. This fictitious layer is assumed to lie in the middle of the copper and is treated as an orthotropic material. In a following changed model the epoxy layer is situated between the steel ring and the copper, in this location the epoxy was suspected to suffer from the highest shear stresses. Both models employ springy trusses as supporting features whichsimulate the real elastic behavior of a sustaining vault. The results display deformations and stress distributions in all layers. A special attention is given to the shear stresses in the epoxy. Hot and cold states of the coils are considered. For comparing purposes also the behavior of appropriate isotropic coils is examined.Furthermore, report is given about the forces transferred from the coils to the sustaining vault. An optimal structure design is carried out concerning the steel ring. An appropriate fully stressed steel ring contour is obtained. Its influence upon the shear stresses in the epoxy layer is considered. A first appendix deals with the non steady state temperature field during coil operating. In a second appendix description is given of the development of the special orthotropic finite element. The third appendix treats the problem of the coherency of the orthotropic properties.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000 ; Retrocat)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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Database coverage:

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